Reactance coil



1,554,250 H. R. WOODROW REACTANCE coI Filed Nov. 2, 1921 INVENTOR Har/y/TWmc/mw A TTORNEY Patented Sept. 22, 1925 UNITED STATES PATENT OFFICE.

OF BROOKLYN, NEW YORK.

' REAGTANGE 0011..

Application filed November 2, 1921. Serial No. 512,225.

To all whom it may concern: I

Be it known that I, HARRY R. \Voonnow, a citizen of the United States, residing in Boston, Massachusetts, have invented certain new and useful. Improvements in Reactance Coils, of which the following is a specification.

Considerable difliculty has been experienced with reactance COIlS as a result of the following causes,deformation of the conductors under the heavy electric magnetic stresses produced under external short circuit conditions, short circuit occurring be tween turns as a'result of particles falling or being drawn into the coil, and short circuit between-turns due to the accumulation of .moisture on the surface of the supports between turns.

My invention aims to provide a reactor in which these difficulties have been overcome and of which the advantages are shown in detail hereinafter. v

The accompanying drawings illustrate an embodiment of the invention.

Fig. 1 is a plan,Fig. 2 a longitudinal sec tion and Fig. "3=-an enlarged portion of the sectional view.

The drawings illustrate a reactor made in two units and using four conductors, two in each unit. Any number of units may. be used and any desired number of conductors in each. 7

Referring first to the outer unit, designated as a whole by the letter A, there are two wires 1 and 2 connected in parallel between the terminals 3 and 4. Each wire is surrounded by a coating or wrapper 5 (Fig;

3) of insulating material, orfthey may be naked'wires held apart by spacers to keep the turns separated before the application of the concrete hereinafter described.

The coils are wound in the form of drums,

I like the coils ofa solenoid for example.

of each other as illustrated; connecting.

They arebound together by cords or tape and spaced alternately inside and outside wires 6 being introduced to connect the lower inner coil" to the next upper outer coil,-

and vice versa. Bythis cross-connecting of the successive coils an equal length is secured for the two wires 1 and 2. a

V The coils arethen cast in a body of concrete 7. The concrete fills in around each wire and holds it firmly in place throughout its. entire "length. The concrete also forms an insulation surrounding the entire length of each conductor, and there is no point at which the conductor is exposed to the air or to the creepage surface on the concrete, with the exception of the two terminals. The potential between turns at a maximum is comparatively small and a small thickness of concrete, where no creepage surface is present, will provide ample insulation for this voltage. The two terminals, where the current enters and leaves 'stitute the complete reactor and may contain one or more wires. Its hollow cylindrical shape has an advantage in that it readily permits additions thereto of further units inside or outside ofthe first. This is important because as a-power station grows it is desirable to add reactors or to increase the capacity thereof. I have shown by way of example a second unit B arranged inside the first with an annular ventilating space between them. This second unit can be made separately and readily set in place within the first. If it is to be used to increase the capacity of the first unit the wires 8 and 9 rious modifications in detail and in the arrangement of the parts may be made by those'skilled in theart without departure from the invention as defined in the following claims. i

What I claim is- 1. A reactance coil including in combination a plurality of coils in the form of drums spaced apart and arranged concentrically and asingle body ofa plastic medium encasing said coils.

2. A reactance coil including in combination a plurality of coils in the form of drums spaced apart and arranged concentrically with the successive turns in each drum spaced apart and a single body of a plastic medium encasing said coils.

3. The combination of a. plurality of reacta-nee units each comprising a. plurality of turns; of a conductor and a cylindrical body of a plastic medium embracing said conductor, one of said units being located within the other.

4. A reactance coil including. in combination a plurality of conductors in druinshaped coils arranged alternately inside of and outside of each other and a single body of a plastic medium embracing said coils.

in Witness whereof, I have hereunto signed my name.

TElARE'Y R. WOODROW. 

